Heidenhain ID: 635066-56
Suitable for most Siemens 1PH6, 1PH7 and 1PH8 spindle motors.
CNC Midt ApS offers replacement of this type of encoder / pulse generator in Siemens motors.
Call and inquire about your options.
Danish: https://www.heidenhain.com/products/search/product-details/exposed-linear-encoders/749147-02